Characteristics Analysis of an Excitation Assistance Switched Reluctance Wind Power Generator

Abstract

In order to fully analyze the characteristics of an excitation assistance switched reluctance generator (EASRG) applied in wind power generation, a static model and a dynamic model are proposed. The static model is based on the 3-D finite-element method (FEM), which can be used to obtain the static magnetization and torque characteristics. The dynamic model, consisting of two lookup tables to describe the EASRG under different current and rotor positions, is built in Simulink to avoid the long computation time of a 3-D FEM model. The dynamic model is able to provide a more realistic assessment of the performance of the EASRG by considering the transient current, while the static model can only consider one constant current. The torque characteristics of the EASRG with different phase currents and commutation angles are studied. The turn-ON angle is found to have a more significant impact on the EASRG performance than the turn-OFF angle. Furthermore, the impact of the width of the rotor pole on the characteristics of the EASRG is studied with the help of the dynamic model. The design with the highest average torque can be achieved if the rotor pole width equals the stator pole width.